Process for securing wrist pins for chain links



July 3, 1923. 1,460,749

7 R. W. DULL PROCESS FOR SECURING WRIST PINS FOR CHAIN LINKS Filed March 25 192,1

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Patented July 3, 1923.

.' UNITED 1 STATES PATENT OFFICE.

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Application filed l larch 23, 1921. Serial No. 454,974.

in 16 her of situations wherever it is desirable to.

hold a pin against ment.

One object of my invention then, is to provide a wrist in which can be readily ap- 20 plied or remove Another object is to provide in connection with a wrist pin, a substitute for the usual upset OITIVBtGd end. Another object is to provide in a wrist pin, easy and convenient means for fastening Other objects will appear from time to time in the specification.

My, invention is illustrated more or less diagrammatically in the accompanying drawings wherein:

longitudinal displace- Figure l is a plan view of a ortion of a chain showing the holding was er in position for upsetting; Figure 2 is a similar view showing the holding washer after upsetting; as Figure 3 is a detail elevation of the holding asher;

igure dis a cross section of the holding washer; I

Figure 5 is a detail elevation of a modified form of holding washer;

Figure 6 shows a strip from which the washer may be made; I Figure 7 is asection through one of the washer forming bosses-on the strip.

- Like parts are indicated by like character in all the drawings. 4

A is a wrist pin; It has at either end an annular. groove A. The distance between the inner boundaries of the two grooves being substantially e ual to the width of the chain or other mem r or members held by or holding the pin. A is a washer having an' annular central opening A of that when the washer is cupped as indicated 7 in my drawings such 8128 in Figures 1 and 4, the annular opening is just 1g enough to slip over the end of the pin, but when the washer is flattened outinto a plane, small to pass over the as it penetratesthe annular groove in the pin, it holds the washer in position on the pm.

For purposes of illustration, the. separate flat link elements B Bof a silent chain extendin in opposite direc/ tions from the pin an held in working direction by the pin, although of course, an ordinary sprocket link or an other link or member might equally well e held by the pin. Y

v C is a flat washer forming strip. One way of forming'the washer :a series of holes C are punched in the strip, strip is punched out to form bosses surrounding the holes and then the finished conical washer C? may be punched out of the bossed portion ofthe strip. Another way of forming these washers would be to form them in the usual manner, then place them in a forming die which would stretch them," enlarging the central hole and giving the washer a conical contour or shape.

In the modified form the washer is shown' instead of bein along one radial is normally smaller p n. a g

.It will be evident that wh1le I have shown an operative device, still made in size, shape,

many changes might be departing and arrangement of parts without materially from and I wish therefore that myrawings be regarded as in a sense, diagrammatic.

The use and operation of my invention areasfollows: In either of the two modified forms, it is the distortion or, splitting or collapsing of the washer itself, which causes it to grip the pin and penetrate within the annular the annular opening is too pin and therefore I have shown then the the spirit of m invention groove within the pin and hold it in position on the pin. The preferred form is of course the first one shown because it is a more operative and satisfactory arrangement, but the distortion of the washer to permit holding of the pin is present in both cases.

In the preferred form, the pin is formed from a rod in the usual way by turning the annular grooves and'cutting oil the wrist pin lengths to suit. These pins are then assembled in a chain or other such device.

The washer may be made and then upset conically or'the washer may be formed from a strip'of material as above suggested having conical bosses thereon. In either case, the central opening of the washer when the ,washer is cone shaped must e large enough to fit freely over the pin. ,The washer is by the operator, then slipped over the pin with the apex end in, until the central portion is in the plane of the annular groove.

Then by means of a tool or other arrangement, the washer is bumped flat until its entire body is in a plane perpendicular to the pin. When this is done, the. material around the outside of thewasher will be under tension, and the material on the inside under compression and the compressive force on the material on the outer portion of the washer will be sufficient to reduce, the

, size of the opening in the washer enough to make it smaller than the outside diameter of the pm and thus cause the washer to penlacunae etrate the annular groove and grip the pin at its reduced diameter.

To disengage the washer, it is only necessary to'pressthe rim outwardly sufliciently to restore it to its cup shape, thus releasing the central compressed portlon of the maagainst the periphery of such was er to align'it in the plane of such channel. 1'

2. The process of securing chain links together, which consists in threading through such. links a circumferentially channeled pin and placing a cupped washer adjacent the links'to be secured, the inner aperture of said washer lying adjacent said links, and in forcing the periphery of said washer in the direction of the links until the body of the washer lies in a plane at right angles to the at the securing poin v Signed at hicago, county of Cook, and State of Illinois, this sixteenth day of March, 1921-.

' RAYMOND W. DULL.

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